With 3 different sub lengths used on this object I thought I'd re-process to see if I could get more detail in the core region. Whichever way I blended the sets I always ended up with pretty similar results, so I reckon this is the definitive version, about the best that I can achieve with the data available. If nothing else I'm pleased to have been able to have made the just resolved Trapezium better defined.
This image is comprised of 103 x 30s subs and 176 x 10s subs taken 28 Dec 2016, blended with 191 x 2s subs, taken 4 Jan 2017. Subs were stacked with AstroArt, and both sets processed in StarTools without using the colour module. Blending was carried out in PWPro and final tweaking in Lightroom. Equipment: Fuji X-T1 through an Altair 102mm f/7 Super ED with a TS Photoline 2" 0.79x reducer/flattener. Mounted on a Nexstar 6/8SE Alt-Az mount.
Compo 30s 75,2 30smsk1 compo aligned 2msk1brt1+10s 10smsk1-1 74,7-23,5-100 10sbrtcve1 LR1-2